When judging the safety factor of cylinder head bolts, the main factors affecting the safety of cylinder head bolts should generally be analyzed, including: (1) design calculation level. If the design calculation accuracy is relatively high, a smaller safety factor can be taken. , should be larger; (2) manufacturing level, if the process technology guarantees better conditions, you can take a smaller safety factor, and vice versa, should be larger; (3) the comprehensive mechanical properties of the material and the actual use The degree of influence of the condition on the value of the bolt safety factor is similar to the previous design calculation level and manufacturing level. However, the extent to which these factors affect the final value of the safety factor is not completely clear, but has some ambiguity. Since the importance of each factor on the safety factor is different, the corresponding weight coefficient wi should be given to each factor. The weight reflects the status and role of each factor in the safety of bolts. It directly affects the results of comprehensive evaluation. It is usually calculated by the designer's experience or by the relevant experts. It can be seen that the design of the general mechanical parts, the value of the safety factor is an important issue in the design calculation, and in the reference or design manual, due to many factors considered, the situation is more complicated, usually given A large range of safety factors. For designs such as tight bolted joints, the value of the safety factor should take into account the material, design level, manufacturing level and the importance of the part in the overall mechanical equipment to the value of the safety factor, regardless of the conditions. In the absence of special recommendations, the method of taking the intermediate value or the safety factor is as large as possible. The method of fuzzy comprehensive judgment can help us solve this problem better. In the design, according to the specific situation of the design, the fuzzy judgment is made and a suitable safety factor is taken. This is also a reasonable value for the safety factor of other parts. Reference value.
The steel wire rope sleeve is a kind of steel wire rope generally used for hoisting, pulling, tensioning and bearing. The length and diameter can be adjusted freely according to the needs. Use steel wire ropes to make rope sleeves, including phosphating coated wire ropes, galvanized steel wire ropes, stainless steel wire ropes, smooth steel wire ropes, etc. Among them, stainless steel wire ropes and galvanized steel wire ropes have good corrosion resistance, and the surface of phosphating coated wire ropes is phosphating. The membrane is an abrasion resistant coating.
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